Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization

Shipeng Shu; Xiaobing Hu; Maryam Kazemzadeh-Atoufi; Tao Liu; Anyu Shang; Mark B. Davis; Robin Ziebarth; Sandeep Dhingra; Robert D. Morgan; Yao Du; Peter W. Voorhees; David N Seidman

doi:10.1016/j.scriptamat.2021.113792

Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization

Shipeng Shu^*, Xiaobing Hu, Maryam Kazemzadeh-Atoufi, Tao Liu, Anyu Shang, Mark B. Davis, Robin Ziebarth, Sandeep Dhingra, Robert D. Morgan, Yao Du, Peter W. Voorhees, David N Seidman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We investigate a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the technologically important carburization process, with multi-length scale experimental techniques. The study focuses on the formation and stability of novel austenitic islands formed within carbide structures during the M₂₃C₆ to M₇C₃ phase-transformation. We demonstrate that the austenitic islands nucleate near the M₂₃C₆/M₇C₃ transformation front, from a supersaturation of metal atoms in the M₂₃C₆-carbide as M₇C₃ grows. After formation, the austenitic islands equilibrate their composition with the matrix temporally but remain relatively stable inside the carbides due to their large sizes (a few hundred nanometers in diameter) and a weak Gibbs-Thomson effect.

Original language	English (US)
Article number	113792
Journal	Scripta Materialia
Volume	197
DOIs	https://doi.org/10.1016/j.scriptamat.2021.113792
State	Published - May 2021

Funding

This research was supported by Dow Chemical Company's University Partnership Initiative. This work made use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); and the MRSEC program (NSF DMR-1720139) at the Materials Research Center. The LEAP tomograph at NUCAPT was purchased and upgraded continuously with grants from the NSF-MRI program (DMR-0420532) and ONR-DURIP program (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). NUCAPT received support from the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. The authors thank Dr. Qingqiang Ren of Northwestern University, currently at Oak Ridge National Laboratory, for valuable discussions.

Keywords

Analytical electron microscopy
Atom-probe tomography
Dual-beam FIB tomography
High-temperature alloys
Phase transformation

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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Shu, S., Hu, X., Kazemzadeh-Atoufi, M., Liu, T., Shang, A., Davis, M. B., Ziebarth, R., Dhingra, S., Morgan, R. D., Du, Y., Voorhees, P. W., & Seidman, D. N. (2021). Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization. Scripta Materialia, 197, Article 113792. https://doi.org/10.1016/j.scriptamat.2021.113792

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title = "Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization",

abstract = "We investigate a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the technologically important carburization process, with multi-length scale experimental techniques. The study focuses on the formation and stability of novel austenitic islands formed within carbide structures during the M23C6 to M7C3 phase-transformation. We demonstrate that the austenitic islands nucleate near the M23C6/M7C3 transformation front, from a supersaturation of metal atoms in the M23C6-carbide as M7C3 grows. After formation, the austenitic islands equilibrate their composition with the matrix temporally but remain relatively stable inside the carbides due to their large sizes (a few hundred nanometers in diameter) and a weak Gibbs-Thomson effect.",

keywords = "Analytical electron microscopy, Atom-probe tomography, Dual-beam FIB tomography, High-temperature alloys, Phase transformation",

author = "Shipeng Shu and Xiaobing Hu and Maryam Kazemzadeh-Atoufi and Tao Liu and Anyu Shang and Davis, {Mark B.} and Robin Ziebarth and Sandeep Dhingra and Morgan, {Robert D.} and Yao Du and Voorhees, {Peter W.} and Seidman, {David N}",

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year = "2021",

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doi = "10.1016/j.scriptamat.2021.113792",

language = "English (US)",

volume = "197",

journal = "Scripta Materialia",

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Shu, S, Hu, X, Kazemzadeh-Atoufi, M, Liu, T, Shang, A, Davis, MB, Ziebarth, R, Dhingra, S, Morgan, RD, Du, Y, Voorhees, PW & Seidman, DN 2021, 'Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization', Scripta Materialia, vol. 197, 113792. https://doi.org/10.1016/j.scriptamat.2021.113792

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T1 - Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization

AU - Shu, Shipeng

AU - Hu, Xiaobing

AU - Kazemzadeh-Atoufi, Maryam

AU - Liu, Tao

AU - Shang, Anyu

AU - Davis, Mark B.

AU - Ziebarth, Robin

AU - Dhingra, Sandeep

AU - Morgan, Robert D.

AU - Du, Yao

AU - Voorhees, Peter W.

AU - Seidman, David N

PY - 2021/5

Y1 - 2021/5

N2 - We investigate a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the technologically important carburization process, with multi-length scale experimental techniques. The study focuses on the formation and stability of novel austenitic islands formed within carbide structures during the M23C6 to M7C3 phase-transformation. We demonstrate that the austenitic islands nucleate near the M23C6/M7C3 transformation front, from a supersaturation of metal atoms in the M23C6-carbide as M7C3 grows. After formation, the austenitic islands equilibrate their composition with the matrix temporally but remain relatively stable inside the carbides due to their large sizes (a few hundred nanometers in diameter) and a weak Gibbs-Thomson effect.

AB - We investigate a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the technologically important carburization process, with multi-length scale experimental techniques. The study focuses on the formation and stability of novel austenitic islands formed within carbide structures during the M23C6 to M7C3 phase-transformation. We demonstrate that the austenitic islands nucleate near the M23C6/M7C3 transformation front, from a supersaturation of metal atoms in the M23C6-carbide as M7C3 grows. After formation, the austenitic islands equilibrate their composition with the matrix temporally but remain relatively stable inside the carbides due to their large sizes (a few hundred nanometers in diameter) and a weak Gibbs-Thomson effect.

KW - Analytical electron microscopy

KW - Atom-probe tomography

KW - Dual-beam FIB tomography

KW - High-temperature alloys

KW - Phase transformation

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JO - Scripta Materialia

JF - Scripta Materialia

M1 - 113792

ER -

Formation mechanism and stability of austenitic islands in carbides in a Ni-Cr-Fe based high-temperature austenitic alloy undergoing carburization

Abstract

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